The Real Story on Chimpanzees and Sign Language. Much needed real information on language ability in primates is contained in 'Chimpanzees’ Use of Sign Language' (Fouts and Fouts). It shows that signing language is passed from adult to infant chimp without human intervention, that it is used for more than to beg for food, that it is used to 'talk' about things not present, that it is used in private, that it is used between the chimps themselves.
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